![]() These cool winds will keep daytime temperatures in the upper 60s to lower 70s. Look for breezy conditions in the afternoon as winds gust to 25 mph in Mill Valley, Tiburon, Sausalito, Benicia and Vallejo. What’s left of the marine layer on Saturday is likely to be limited to the delta and San Pablo Bay. A few parts of the highlands, like the Mayacamas Mountains, and inland Solano County cities like Fairfield and Vacaville, could flirt with 80-degree temperatures by 2 p.m. North Bay: Ample sunshine and warm, dry air stemming from an area of high pressure on Saturday will kick off a warming trend in the Napa, Santa Rosa and Petaluma valleys, raising daytime highs to the upper 70s. Nighttime lows will fall to the 50s after sunset, with patchy fog possible by the airport and along the hillsides - including Portola Valley, San Andreas Lake and Emerald Hill. Look for warmer conditions along the I-280 and highway 101 corridors, as sunshine raises temperatures to the lower 70s for Redwood City, Menlo Park and Atherton. Expect a sunnier morning across the rest of the Peninsula.īy Saturday afternoon daytime highs will climb to the lower 60s by the water and San Bruno Gap - including Daly City, South San Francisco and Millbrae. Reduced visibility and overcast conditions will be limited to the immediate coast, though patches of fog could briefly spread into Pacifica and Half Moon Bay around dawn and then highways 92 and 84 through 10 a.m. Pacific Coast and Peninsula: The marine layer will billow shallow plumes of fog and mist along Highway 1 over the course Saturday morning. Look for overnight lows in the lower 50s. Temperatures will fall to the 50s after sunset, with patchy fog possible Saturday night in the hillsides and right along the coast. Calmer conditions along Market Street from the Castro to the Embarcadero will allow daytime highs to reach the mid-60s along the bay shore and upper 60s in the rest of the city. ![]() Winds will briefly gust to 25 mph along Highway 1, the Golden Gate Bridge and most of the hillsides, including Twin Peaks, Billy Goat Hill and Diamond Heights. Sunshine will prevail Saturday afternoon. San Francisco: An area of high pressure will limit the growth of clouds and fog to the outer Sunset and Richmond districts and the Embarcadero around dawn, leading to sunnier conditions east of Sutro Tower through the rest of the morning hours. Thankfully, the marine layer will suppress most of the bad air from making it to the coast. Residents along San Francisco Bay might even be able to catch some of the haziness from this setup by looking out to the eastern sky. This will shield most of the Bay Area from dealing with the worst of the particulate levels coming out of the Sacramento Valley. Weather models forecast that the marine layer’s winds will manage to undercut the area of high pressure, leading to a rush of cool, clean air after 2 p.m. The rest of the inland valleys in the East Bay can also expect periods of reduced air quality over the course of the day, but not for long. Particulates from the valley are then likely to spill into Solano, Contra Costa and Alameda counties, worsening the air.ĪirNow forecasts on Friday called for cities like Vacaville and Fairfield to expect moderate air quality for most of the day on Saturday, meaning that the air could cause health concerns for sensitive populations. Hot, calm air over the Sacramento Valley will also allow pollution levels to rise a bit Saturday afternoon. West winds will keep temperatures closer to the 60s and 70s by the water while pollution is drawn out to Solano and Contra Costa counties. ![]() This weekend’s ridge of high pressure will likely restrict the cool, clean air from the marine layer to San Francisco Bay. But the system will linger, and the stagnating atmosphere could slightly worsen air quality through the afternoon, especially in a few parts of the Bay Area.
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